30 terms

HN Chem Chapter 3 (no "dead guys")

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Terms in this set (...)

the atomic number shows the ...
number of protons
the mass number shows the...
number of protons and neutrons
the average atomic mass is the...
weighted average of all the naturally occurring isotopes
isotope
atoms of the same element having different masses due to different numbers of neutrons
nuclides
refers to the nucleus of an atom which includes protons and neutrons
ion
an atom or group of atoms that have a positive or negative charge
anion
negative charge
cation
positive charge
electrons
have a -1 charge, 0 (mass number) and a very low amu number
proton
have a +1 charge, 1 (mass number), and 1.007276 amu number
neutron
have a 0 charge, 1 (mass number), and 1.008665 amu number
protium (H-1)
has 1 proton, 0 neutrons, and 99.985% abundance
deuterium (H-2)
has 1 proton, 0 neutrons, and 0.015% abundance
tritium (H-3)
has 1 proton, 2 neutrons, and a trace amount
62 neutrons and 48 protons
How many protons and neutrons in Cd-110?
15 protons, 19 neutrons, and 18 electrons
How many protons, neutrons, and electrons
in P P(-3)-34?
51 protons, 71 neutrons, and 46 electrons
How many protons, neutrons, and electrons
in Sb+5-122?
mole (mol)
the measure of the amount of substance
6.02 x 10^23
what is the mole/Avogadro's number? (the number written in scientific notation)
atomic mass unit (amu)
a unit of mass equal to one-twelfth the mass of a carbon 12 atom
!!!!!!!!! know this
know this!
divide by the molar mass
to convert mass to moles, you...
multiply by the molar mass
to convert moles to mass you...
multiply by 22.4 L
to convert moles to volume you...
divide by 22.4 L
to convert volume to moles you...
multiply by 6.02 x 10^23
to convert moles to atoms, particles, molecules you...
divide by 6.02 x 10^23
to convert atoms, particles, and molecules to moles you...
1(.992) + 2(0.008) = 0.992 + 0.016 = 1.008 amu
Hydrogen consists of three isotopes:
protium (H-1), deuterium (H-2 ), and tritium (H-3).
Calculate the average atomic mass of hydrogen if the relative abundance of H-1 is 99.2 %, H-2 is 0.8%, with only trace amounts of H-3.
69.72 = .64(69) + .36(x)
69.72 = 44.16 + .36x
=71 amu
There are two isotopes of gallium. If the average atomic mass of gallium is 69.72 amu and the relative abundance of Ga-69 is 64%, calculate the mass number of the second isotope of Ga.
.246(202) + 209 (.754) =
= 157. 586 + 49.692
= 207.278 amu
There are two isotopes of lead. Pb-202 having a relative abundance of 24.6% and Pb-209. Calculate the average atomic mass of Pb.